题目

下列物质的用途与其化学性质无关的是 A．用碳酸氢钠治疗胃酸过多        B．充入稀有气体做彩灯 C．天然气取暖                    D．用镁粉做烟花 答案：BCan you come over to my house           Wednesday afternoon _____ 16:00?A. at; at B. on; atC. at; on